Sea World? How'd that discussion get in here? My family and I hadn't been to Sea World in years, but bought AP's that spanned December 2012-2013. We had a couple of trips during that time, and hit Sea World 7 or 8 days. The short summary is that it was well worth the $85 or so each for the APs, but I would have been annoyed paying that much for a day (the deal was pay for a day, get a year).
Good things
We thought the three big rides (Kraken, Manta, and Journey to Atlantis) were all very good. We liked the aquariums all over the park -- particularly my four year old animal lover. Turtle Trek and Shark Encounter are attractions that are worthy of any park, and the Dolphin and Killer Whale shows were great as well. The holiday themed ice show followed by fireworks was very good. Polar Express was fun. And the viewing and feeding opportunities for seals and sea lions, dolphins, beluga whales, walrus, and other animals were great.
Bad Things
Antarctica is a waste of a great technology. They blew it. Food is terrible -- overpriced, unspecial, and bad enough to actually detract from the day. Kids area is OK, but the rides are not all that much fun, and climbing area, while huge, is limited in what there is to do. The rest of the shows, beyond those already mentioned, were just "eh". Not terrible, but not memorable either.